Dressing device for grinding wheels



April l5, 1930. l l p. KLAMP ET AL 1,754,630

DRESSING DEVICE FOR GRINDING WHEELS Filed March 5, 1928 `2 SheetsTSheetl ln-m April 15, 1930. P. KLAMP ET AL 1,754,630

DRESSING DEVICE FOR GRINDI-NG WHEELS Filed March 5, 192B 2 Sheets-Sheet2 56 Y ,H /e 7 7g /4 y Y TM5/R ATTO/aua Ys.

Patented Apr. 1930l UNITED.; STATES ,PATENT OFFICE :PAUL KLAMP ANDV:rorrN J. WOOLLEY, or CANTON, OHIO, AssreNoRs rro THE frmxnN lnOLLnnBEARING COMPANY, or CANTON, OHIO, A CORPORATION or omo DRESSING DEVICEIEOR -GRINDING!IWH'1311311125 4Application led Hatch 5,1923. Serial11m-259,096.

This invention relates to a device for dressing or truing the grindingface of the grinding wheel of an automatic grinding machine, Itsprincipal 'object is to produce a grinding device which can be readilyadjusted to dress grinding wheels having peripheral or radial grindingfaces of concave or convex curva- `ture of dierent radii. Other objectsare like symbols refer to like partswherever they occur:

Fig. 1 is a plan viewvof a dressing device embodying our invention,

Fig. 2 is a side elevation of the device, Fig. 3 is a verticallongitudinal section 'through the device on. the line 3-43 in Fig. 1,

Fig. 4 is a vertical'transverse'cross-section a through the device on'the line 4.-'-4 in Fig. 2,

and

Fi g. 5 is' a plan view showing the device in "iandther of its positionsof adjustment., Y

The wheel dressing or truing device shown in theaccompanying drawingcomprises a circular base member 1 provided with diametrically opposed'laterally pro.- jectingv lugs 2 having outwardly opening notches 3therein adapted to receive T-bolts 4, whereby the base may be clampedtothey slideway of a grinding machine (not shown). The upper surface ofthe stationary base member 1 is'V provided at its center with a pocketbearing in the form ofa circular recess 5 and near its edge with acircular groove 6 disposed concentric with the central circular recess.lAn arcuate guide plate 'or dovetail way 7 is provided at its centerwitha downwardly extending circular pivot boss 8'whichl is journaled inthe central pocket bearing 5 in the base'plate, whereby said guide plateisl adapted to otateon the base plate about the center A o said bearingas a center. The pivot boss 8 of the arcuate guide plate is held inengagement with the pocket bearing 5 of conical recess provided thereforin the center of the curved guide plate 7, and adepending shanlrportion, which extends through a central hole in the bottom of therecess 5 in said base member 'and is threaded at its lower end toreceive a `pair of lock nuts 12," The side marginal edges of the rotaryway 7 are curved in arcs of'circles described from a center indicated atB` in Fig. 1 of the drawing, the two centers A-B beingspaced ten inchesapart.

Bolted to one end of the arcuate-guide platev7 is a clamp block 13,having a depending portion slidable inthe circular groove 6 of the uppersurface Of'tlgbase member l. The groove engaging portion of said'clampblock is slotted andis also: provided-with a threaded bore having aconical lowerjfend portion; and threaded into said boreis a screw 14having a conical lower end adaptedto bear against the conical bore inthel slotted lower end of the clamp block. By this ar-l rangement, whenthe set screwjs tightened it spreads apart the slotted lower en oftheclam block against the side walls of the circu arl groove and thuspreventsV I otar'y Igioveinent of the guide plate on the base memer 1./A slide 15 has a circular base portion which rests on the base member 1and is provided on its underside' with a downwardly opening dovetailgroove orchannel 15a which slidably engages the rotatably supported`curved way 7 and is curved to correspond to curvature of i the basemember 1 by meansof a pilot bo1t 10 A having a conical head 11, whichseats in a said way, thereby'permitting the sildevto be slid across thebase member in/a circular arc 'whose center is located at B. The slideV15 may be locked to the guide plate 7 for movementi-herewith by meansof a screw 16, which engages a threaded hole in the-slide and has atapered/'lower end portion adapted to cooperate with a tapered hole 7ain the top of the guide plate. Y

The upper surface of the slid'; 15 is -provided .with a dovetail riborway 17 which extends' radially with respect to the center'A;

v and afdiamond carrier 18 has a base portion 19 which rests on theslide 15 'and is provided on its under side with a dovetail groove' orchannel 2O which slidably engages the way on `the slide 15. The diamondcarrier 18 is provided with an upstanding bracket or standard 21 whoseupper end has a cylin drical bore 22 extending horizontally therethroughin directions parallel to the direction of sliding movement of saidcarrier. Slidably mounted in the bore 22 is a cylindrical diamond holder23, one end of-which has grindin fis a. diamond 24 set .therein fordressing the Wheel. The diamond holder 23iis clampe in the bore 22 ofthe standard 21 of the diamond carrier 18 in any desired posi- -of thebracketand a nut on the other side thereof and is rotated by means A'ofa crank 26 secured to its outer end. The threaded portion of the screw.extends loosely through a longitudinal groove provided therefor in Athegway 17 -of the slide 15 and is threaded through a threaded bore in alug 19EL which dependsl from the underside of the base 19 of thediamondfgcarrier 18. By this arrange-4 ment, rotation of the screw bymeans of the crank caues the diamond carrier -18 to slide radially o thecenter A.' The 'slide 15 may be moved about the centers A 'or 1B, tocause the dlainond to traverse the grinding face of the grinding wheel Cthat isv lto be dressed, by means of a screw 29`disposed substantiallyat r1ght angles to the screw 26. One end of the .screw 29 is threadedthrough a threaded bore 1n the head of a swivel screw 30 threaded intothe upstanding bracket 27 which supports the outer end of the screw 26;and the opposite end of said screw 29 passes through a smooth bore inthe upper end of a swivel nut 31,

Which is threaded on the upstanding freel outer end. portion 32 of abracket 32. The screw `29 1s' rotated by means of a crank 29a fixed toone end thereof and is held against .axial movement preferably by meansof collars located on opposite sides of the 'swivel nut 31. It is notedthat the swivel screysT 30 `and swivel nut 3l are loosely screwed intheir supporting brackets 27 and 32, respectively, so as to swivelthereon and thus permit the screw 29 to change its angular; positionwhen said screw is rotated to swing the slide 15. The inner end portion32b of the bracket 32 is curved to iit the circular base member 1 and isprovided withshoes 33 slidable in a circumferential slideway 34 formedin the peripheral edge of said base member. The bracket 32 isAadjustably secured to the base member F 1 by means of cap screws 35which pass through slots in the bracket and are threaded into any one ofa series of circumferentially spacedholes 35a in the peripheral edges ofsaid base. By this arrangement, the bracket 32 may be adjustedcircumferentially of the base 1 to position'the screw 29 atsubstantially right angles to the screw 26 when the slide is rotated tobring the diamond into a position opposite the grinding face of thegrinding wheel.

Extending longitudinally of the way 17 on the slide 15 near the frontedge thereof is a scale S which is graduated to give readings in inchesand fractions thereof; and each lon tudinal side edge of the baseportion of te diamond carrier 18 has two index marks 36 and 37 cutthereon adapted to cooperate with the scale on the slide 15. In thepresent device, the index marks 36 and 37 are spaced two and one-halfinches apart, along each sideedge of the carrier, with the two mark's onone side of the carrier in line with the two marks on the other sidethereof, and a reading obtained by means of the index marks on the sideof the carrier next to the scale S. By this arrangement, the diamondcarrier 18 may be turned end for end pn the way 17. As shown in thedrawing, the scale S on the slide 15 has two sets of numerals, the innerset reading .from 4 to `0 and from 0 Kto 6; and Vthe outer set readingfrom 6 to 16.

The operation ofthe device is as follows:

When it is desired to dress a grinding wheelprovided with a convexradial or peripheral grinding surface having a radius' curvature of fourinches or less, the diamond carrier 18 is vpositioned on the way 17 ofthe adjustable slide 15 with its diamond supporting standard 21 locatedat the right-hand end of saidA carrier. The diamond holder 23 is thenpositioned in the bore 22 with its diamond located on the left-hand sideof the standard and is adjusted longitudinally of the supporting bore'22 by means of a gage block 39, which is shown in dotted lines of Fig.2 of the drawing, to bring the diamond 24 in line with the index marks37 of the carrier, after which the holder 23 is locked in position bythe set screws-f25. Assuming that the convex sur- Aface that is to bedressed has a radius of three 3, the "base plate lis movedlongitudinally of the bed of the grinding machine and the slide 15 andbracket 32 rotated on the base about the-center A- to bring the diamond24\nto position opposite to and in Contact with the surface that is tobe dressed. The-bracket 32 is then clamped to the Vbase member by meansof the cap screws ;"and the convex grinding surface of the wheelisdressed by manipulating the crank 29a to caus the diamond to move backand forth 'across the grinding surface While the grinding wheel rotates.When it is desired to dress a grinding wheel y providedl with a convexgrinding surface iaving aE radius of curvature of from 4 to 410% inches,the diamond carrier 18 is turned end for end on the way 17 of the slidewithout disturbing the adjustmentof the diamond, and the index mark 36used in adjusting the carrier longitudinally of the, way to set thediamond for the desired radius. The screw 16 is then disengaged from thehole 7a in the 7arcuate plate 7, which is then-clampedvto the base 1 bytightening the screw 14 .in the .clamp block 13, thereby preventingrotation with said way about the center A and causing the slide to slidealfong thearcuate slideway about thel point B as a center. When it isdesired to adjust thedevice for dressing a convex surfac'eghaving aradius. of from 10%* inches tov 14e` inches. thegrinding carrier ispositioned on the slide with 'its standard to the right and with thediamond point projecting fromthe left-hand side of-thestandard in linewith the index mark'37,'ivhich is u'sed in locating the' diamond for theradius desired, and the Vdevice` is adjusted to cause4 the diamond toslide on the arcuate way about lthe/point B as When it isdesired todress ya grinding wheel provided with a concave grinding surface havinga radius of curvature o'f`61/4 inches or less, the diamond carrier ispositioned on the way ofthe slide with itsstandard located to the left,and with the diamond in line with Vthe slide with its standard located`at the left' the index mark 36/and the device is adjusted to cause thediamond to move about the ccnter A. When it is desired to adjust thedevice for dressing a concave surface having a radius of from 6% to 13%inches, the di-a-I mond carrier is positioned on the slide with Vitsstandard to the left and with ,the diamond 'in li-ne with the indexmarks 37, and the deu f vice is adjusted to cause the diamond to swinghandend of the carrier, is provided with -a third index mark 38 located21/2 inches to the right ofthe index mark 37. The purpose of this thirdindex mark 38 is to enable-the oper-v ator to obtain a reading when-th'e two index 4ingthe center B. With the diamond in line with themarks 37, a correct reading is obtainedwith the mark 38 by adding 21/2inches' to the amount indicated by the mark 38 when using the center Aand by subtracting 21/2 inches when using the center B. f

Obviously, the hereinbefore described dressing device admitsofconsiderable modification without departing from the invention;therefore, we do not wish to be limitedto the precise arrangement" shownand described.

What we claim is:

1. A dressin device comprising a base, a way rotatab y supportedthereon, and a dressing tool supported on said way for rotationtherewith and for sliding movement thereon along'a circular are whosecenter is offset with respect to the rotary axis of said rotary member.

2. A dressing device comprising la base, an arcuate way rotatablethereon, a slide movable along said way, and a dressing tool mountedonsaid slide for sliding .movement crosswise of said way, said tool beingreversible end for end on said slide.

3. A dressing device comprising a base, a

member rotatably supported thereon, andf provided with an arcuate way,a'dressing tool supported on said member for sliding movement along thearcuate way thereof, means for locking said member to said base, and

means for locking said tool against sliding movement along said arcuateway.

4. A dressing device comprising a base having an arcuate way rotatablysupported thereon, a slide movable along said way, a dressing toolmounted on said slide for slid- Iing mQvement crosswise of said way, and

means for adjusting said dressing tool for concave and convex surfaces,said device being provided (with a scale for indicating the distancebetween the cutting edge of the dressing tool and the rotary axisof theway and the distance between said edge and `the center of the radius ofcurvature of said arcuate way. j

' 5. ,A dressingfdevice comprising a base memberKan arcuateway'rotatably supported von said base member, a slide slidable on saidarcuate way, a tool carrierslidable on said slide, a dressing toolmounted on saidtool carrier, means for locking said arcuate way againstrotation on said base member, and means for locking'said slide to saidarciiate way. v

tool adjustably mounted in said tool carrier, and means for sliding saidtool carrier along g said slide.

7. A dressing devicel comprising va base.

member, an arcuate way rotatably supported on said base member, meansfor locking said arcuate way to said base memberfa slide slidable alongsaid arcuate way, means for locking said slide to said way, a toolcarrier slidable along said slide, said tool carrier being reversibleend for end on saidslide, a cutting tool adjustably mountedA in saidtool carrier,V means for sliding said tool vcarriei` alongl said slide,and means for moving said slide along `said arcuate way and forpartially rotating` lsaid way about its axis of rotation.

8. A dressing device comprising a base member, an arcuate way rotatablysupported on said base member, means for locking said arcuate Way tosaid base member, a slide slidable along said arcuate way, means forlock- ,ing said slide to said Way, a tool carrier slidable along saidslide, said tool carrier being reversible end for end on said slide, acutting tool adj ustably mounted in said tool carrier, means for slidingsaid tool carrier along said slide, and means for moving said slidealong said arcuate way and for partially rotating said way about itsaxisof rotation, said means comprising a bracket secured to said base andv ascrew journaled in said bracket and having threaded lengagement withsaid slide.

g. A dressing device, comprising a base member, an arcuate way rotatablysupported on-sa'id base member,'means for locking said arcuate wa 'tosaid base-member, aslide slidable along said arcuate way, means forlocking said slide to said way, a tool carrier slidable along saidslide, said tool carrier being reversible end for endron said slide, acutting tool adjustably mounted in said tool carrier, means for slidingsaidv tool carrier along said slide, means for moving said slide alongsaid arcuate way and for partially rotating said way about its axis ofrotation, said means comprising a bracket secured to said base and ascrew journaled in said bracket and having threaded engagement with saidslide, and

` means for adjusting saidv bracket along a'cir.-

cular arc described from the center of rotation of said arcuate way.

, 10. AV dressing device comprising a .base

member, an arcuate Way rotatably supported,

on said base member, means for locking saidV arcuate way to said basemember, a slide slidable along said arcuate way, means for locking saidslide to said way, a toolcarrier slidable along saidy slide, Jsaid toolcarrier being reversible end for end'on said slide, means for movingsaid tool carrieralong said slide, a cutting tool adjustably mounted insaid tool carrier, means for sliding said tool carrier along said slide,means for moving said slide valong said arcuate way and for partiallyrotating said Way about its axisof rotation, said means comprising abracket secured to said base and a screw journaled in said bracket andhaving threaded engagement with said slide, means for adjusting saidbracket along a circular arc described from the center of rotation ofsaid larcuate Way, v and means .on said tool carrier andj said slide`for indicating -tlie'distance between the cuttingedge of the tool andv-the center of rotation and the center of curvature of said arcujateslide.

` 111. vAidressing device comprising a base member, an arcuate Wayrotatably su portedl on said base member, means for locking said arcuateway to said base member, a slide slidable along said arcuate way, meansfor locking saidrslide tosaid Way, a tool carrier slidable a ng saidslide, said tool carrier being reversible end for end on said slide,means for moving-said tool carrier along said-slide` rotating said wayabout its axis of rotation said means comprisingf'a bracket secured tosaid base and a screw Journaled inisaid brackvet and having threadedengagement with said slide, means for adjustingaid bracket along acircular arc described from the center 'of rotation of said arcuate Way,and means lon said tool carrier and said slide for indi- Jcating thedistance between the cutting edge of the tooland the center of rotationand the center of curvature ofI said larcuate slide, said meanscomprising a scale on said slide and index marks on said tool carrier.

Y. rSigned at Canton, Ohio, this 1st day ofy

